Address PR feedback

Author: amcasey

src/Servers/Kestrel/Core/src/Internal/Http2/Http2Connection.cs

@@ -33,14 +33,14 @@ internal partial class Http2Connection : IHttp2StreamLifetimeHandler, IHttpHeade
         private const PseudoHeaderFields _mandatoryRequestPseudoHeaderFields =
             PseudoHeaderFields.Method | PseudoHeaderFields.Path | PseudoHeaderFields.Scheme;
 
-        private const string EnhanceYourCalmMaximumCountProperty = "Microsoft.AspNetCore.Server.Kestrel.Http2.EnhanceYourCalmCount";
+        private const string MaximumEnhanceYourCalmCountProperty = "Microsoft.AspNetCore.Server.Kestrel.Http2.MaxEnhanceYourCalmCount";
         private const string MaximumFlowControlQueueSizeProperty = "Microsoft.AspNetCore.Server.Kestrel.Http2.MaxConnectionFlowControlQueueSize";
 
-        private static readonly int _enhanceYourCalmMaximumCount = GetEnhanceYourCalmMaximumCount();
+        private static readonly int _enhanceYourCalmMaximumCount = GetMaximumEnhanceYourCalmCount();
 
-        private static int GetEnhanceYourCalmMaximumCount()
+        private static int GetMaximumEnhanceYourCalmCount()
         {
-            var data = AppContext.GetData(EnhanceYourCalmMaximumCountProperty);
+            var data = AppContext.GetData(MaximumEnhanceYourCalmCountProperty);
             if (data is int count)
             {
                 return count;
@@ -186,7 +186,7 @@ public Http2Connection(HttpConnectionContext context)
             _serverSettings.InitialWindowSize = (uint)http2Limits.InitialStreamWindowSize;
 
             _maximumFlowControlQueueSize = ConfiguredMaximumFlowControlQueueSize is null
-                ? 4 * http2Limits.MaxStreamsPerConnection
+                ? 4 * http2Limits.MaxStreamsPerConnection // 4 is a magic number to give us some padding above the expected maximum size
                 : (int)ConfiguredMaximumFlowControlQueueSize;
 
             if (IsMaximumFlowControlQueueSizeEnabled && _maximumFlowControlQueueSize < http2Limits.MaxStreamsPerConnection)
@@ -1224,6 +1224,8 @@ private void AbortStream(int streamId, IOException error)
         void IRequestProcessor.Tick(DateTimeOffset now)
         {
             Input.CancelPendingRead();
+            // We count EYCs over a window of a given length to avoid flagging short-lived bursts.
+            // At the end of each window, reset the count.
             if (IsEnhanceYourCalmEnabled && ++_tickCount % EnhanceYourCalmTickWindowCount == 0)
             {
                 Interlocked.Exchange(ref _enhanceYourCalmCount, 0);

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs

@@ -395,23 +395,23 @@ public void Http3GoAwayStreamId(string connectionId, long goAwayStreamId)
             Http3GoAwayStreamId(_http3Logger, connectionId, goAwayStreamId);
         }
 
-        [LoggerMessage(54, LogLevel.Debug, @"Connection id ""{ConnectionId}"" aborted since at least ""{Count}"" ENHANCE_YOUR_CALM responses were required per second.", EventName = "Http2TooManyEnhanceYourCalms")]
+        [LoggerMessage(54, LogLevel.Debug, @"Connection id ""{ConnectionId}"" aborted since at least {Count} ENHANCE_YOUR_CALM responses were recorded per second.", EventName = "Http2TooManyEnhanceYourCalms")]
         private static partial void Http2TooManyEnhanceYourCalms(ILogger logger, string connectionId, int count);
 
         public void Http2TooManyEnhanceYourCalms(string connectionId, int count)
         {
             Http2TooManyEnhanceYourCalms(_http2Logger, connectionId, count);
         }
 
-        [LoggerMessage(55, LogLevel.Debug, @"Connection id ""{ConnectionId}"" exceeded the output flow control maximum queue size of ""{Count}"".", EventName = "Http2FlowControlQueueOperationsExceeded")]
+        [LoggerMessage(55, LogLevel.Debug, @"Connection id ""{ConnectionId}"" exceeded the output flow control maximum queue size of {Count}.", EventName = "Http2FlowControlQueueOperationsExceeded")]
         private static partial void Http2FlowControlQueueOperationsExceeded(ILogger logger, string connectionId, int count);
 
         public void Http2FlowControlQueueOperationsExceeded(string connectionId, int count)
         {
             Http2FlowControlQueueOperationsExceeded(_http3Logger, connectionId, count);
         }
 
-        [LoggerMessage(56, LogLevel.Debug, @"Connection id ""{ConnectionId}"" configured maximum flow control queue size ""{Actual}"" is less than the maximum streams per connection ""{Expected}"" - increasing to match.", EventName = "Http2FlowControlQueueMaximumTooLow")]
+        [LoggerMessage(56, LogLevel.Debug, @"Connection id ""{ConnectionId}"" configured maximum flow control queue size {Actual} is less than the maximum streams per connection {Expected}. Increasing configured value to {Expected}.", EventName = "Http2FlowControlQueueMaximumTooLow")]
         private static partial void Http2FlowControlQueueMaximumTooLow(ILogger logger, string connectionId, int expected, int actual);
 
         public void Http2FlowControlQueueMaximumTooLow(string connectionId, int expected, int actual)